MIOMD-XI Speakers    
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1.  Dr. Zbig Wasilewski, National Research Council, CANADA
Invited Talk: MBE growth and optimization of THz quantum cascade lasers: towards high temperature operation
Speaker Biography: Zbig Wasilewski received the Ph.D. degree from the Institute of Physics, Polish Academy of Sciences in 1986. His doctoral work focused on the influence of high hydrostatic pressure on the magnetooptical properties of shallow and deep donors in InSb. In 1988, after spending 14 months at Imperial College in London, where he expanded his work to other material systems and nanostructures, he joined the National Research Council of Canada where he worked until July 2012, focusing primarily on the molecular beam epitaxial growth and characterization of quantum structures and devices based on III–V semiconductor compounds. In July 2012 Dr. Wasilewski joined faculty of University of Waterloo where he holds a position of Waterloo Institute for Nanotechnology Endowed Chair and is a full professor at the Department of Electrical and Computer Engineering. He is a coauthor of over 400 refereed journal articles and conference proceedings papers.

Summary: Since their initial demonstration in 2002, THz QCLs have achieved a remarkable progress and can now operate in 1.2–4.5 THz spectral range with maximum operating temperatures for the best devices of ∼200 K. Increasing their operating temperatures to commercially available thermoelectric coolers range (∼240 K) will make THz QCLs very attractive to a broad range of potential applications in areas such as biological sensing, pharmaceutical sciences, THz wave imaging and hazardous materials detection, to mention just a few. In this talk we present a condensed account of this quest with emphasis on the molecular beam epitaxial process and related challenges. We also present the latest results for the new THz QCL designs aimed at pushing maximum operating temperature Tmax still further along the path towards the thermoelectric coolers temperatures.
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